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stfn :raspberrypi: :python:

New blog post!

In which I show how I am powering a typical 120mm PC case fan from a USB port to quietly cool my Raspberry Pi cluster.

CW: bad soldering skills

stfn.pl/blog/59-powering-fans-

A powerbank powering two small 5V fan via a DIY adapter made from a USB connector and a prototype board.
My Pi cluster being cooled using a 120mm PC case fan.
#RaspberryPi#boinc#diy_electronics
Feb 01, 2025, 05:06 PM·Public
5boosts·8favorites
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stfn :raspberrypi: :python:

btw, my cluster reached almost 10k points in @einsteinathome

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Tom

@stfn You can get case fans that plug in via USB you know?

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stfn :raspberrypi: :python:

@tripplehelix but there's no DIY fun in that

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Nikolay Neupokoev 🐉🏔️

@stfn why don’t you use USB 3? It can give you faster speed

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stfn :raspberrypi: :python:

@mikolasan whoa, why haven't I think of that?!

my mind is blown.
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7666
@stfn @mikolasan gonna be extremely pedantic here and say that the voltage has not increased with USB 3, but the amperage limit was upped from 500mA to 900mA, so you can run a bigger fan that pushes more air, but not necessarily at any speed faster than what USB 2 offers.
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stfn :raspberrypi: :python:

@7666 @mikolasan but what about USB-C?!

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7666
@stfn @mikolasan what if i told you that type C cables and ports missing all of the USB 3.0 specific pins exist...
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stfn :raspberrypi: :python:

@7666 @mikolasan nothing will surprise me about the mess that is the USB ecosystem

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Nikolay Neupokoev 🐉🏔️

@stfn @7666@comp.lain.la terrible idea - this will make possible to connect your DIY board upside down 🙀

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stfn :raspberrypi: :python:

@mikolasan oh no, that would make it run in reverse!

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Nikolay Neupokoev 🐉🏔️

@stfn hmm, yes but which way of air flow is the correct one?

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stfn :raspberrypi: :python:

@mikolasan looks like we are getting into deep philosophical questions

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stfn :raspberrypi: :python:

@artfulsodger sure, that's another solution :)

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